Meryl was raised by her mother Eva Robertson, who remarried to become Eva Rowlands and lived to 104.
The young Meryl also spent a lot of time with her grandmother, who took in foster children who were company for the little girl.
Growing up, Meryl worked at the Bargain Stores and Regal Tearooms in Whangarei before her marriage to plumber and drainlayer James Raymond Eyles.
They had three children - Colin (deceased), Barrie and Raewyn.
"Dad died when he was 53, so mum has been a long time alone," Raewyn said.
But with a ukelele accompanying her family singing Happy birthday, she wasn't alone on Saturday when her relatives, including eight grandchildren and 13 great-children helped celebrate her century.
Family members travelled from Auckland, Wellington, Kaikoura and England. "She got a lovely card from the Queen as well as messages from the Governor General, the Prime Minister and MPs," Raewyn said.